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| Description: The first argument of a binary relation exists. (An artifact of our ordered pair definition.) |
| Ref | Expression |
|---|---|
| brrelexi.1 |
|
| Ref | Expression |
|---|---|
| brrelexi |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brrelexi.1 |
. 2
| |
| 2 | brrelex 2446 |
. 2
| |
| 3 | 1, 2 | mpan 518 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: vtoclr 2449 vtoclrbr 2450 vtoclibr 2451 oprprc1 3019 breng 3280 brdomg 3281 sdomirr 3314 sdomex 3315 ensymg 3316 unen 3338 sbth 3359 domnsym 3365 ensdomtr 3372 domsdomtr 3374 sdomen2 3380 php3 3411 infsdomnn 3426 alephnbtwn2 3675 alephsucdom 3685 prcdpq 3891 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-xp 2424 df-rel 2425 |